Actually, John, you may want to check the concealed carry laws in your state and city. Chances are, its perfectly legal to carry a concealed weapon with a permit, and unless you live in California, New york, or Missouri (GRRR!) it's probably not to difficult to get that license if you are a law abiding citizen. However, this doesn;t keep any criminals from doing as you say.

Defenses against numb-chucks:1. Run away.2. Shoot him.3. Throw rocks or garbage cans.4. Hit him with a two by four.5. Hit him with a car.6. Use a shield.7. Wear a riot helmet, kevlar vest, and arm guards. EVERYWHERE.8. Sic a pack of wild dingoes on him.9. Use a hostage as a human shield.10. Mace him.11. lure him into a VERY small room.12. Throw a net over him.13. Call the nuthouse on your cell phone and tell them you've found their escaped prisoner.